There are some anecdotal reports of benefits received from the cannabis industry related to managing ALS.

"Within 10 days, Bob had his right arm back, and could even throw a football. His overall condition improved tremendously. He stopped using all pharmaceuticals, including the codeine and aspirin he needed for pain. Unlike pills, the oil had a number of remarkable side effects. The high blood pressure Bob had struggled with for years completely dropped, to the point where he had to control his oil intake to make sure it did not get too low.

Indeed, CB1 activation is linked with hypotensive effects. Nummular eczema, asthma, and a herpes infection also all disappeared. Scientific studies indicate the potential of cannabinoids to benefit these conditions through broncodilatory, anti-inflammatory, and anti-viral capabilities. Also, a January 2015 review implicated cannabinoids in the potential treatment of many neuroinflammatory disorders, including ALS."
http://illegallyhealed.com/keeping-als-at-bay-with-cannabis/

While the above was anecdotal, it seems to rhyme with an HHS patent in preparation for something fishy...

""The cannabinoids are found to have particular application as neuroprotectants, for example in limiting neurological damage following ischemic insults, such as stroke and trauma, or in the treatment of neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease and HIV dementia. "
http://www.google.com/patents/US6630507

Interestingly enough, Parkinson's is in there too :)